CLCOR Cloud And Hybrid Services Practice Test 6 — 15 Questions

Question 1

When troubleshooting a Hybrid Media Service node, which log file is most critical for determining if the media is being routed correctly to the cloud?

Accepted Answer

Hybrid Media Service logs. The Hybrid Media Service logs are the most critical for troubleshooting media routing issues because they contain detailed information about how the Hybrid Media Service node handles media streams, including routing decisions and errors. The correct answer is A.

Answer

Cisco Discovery Protocol logs

Answer

System event logs

Answer

Call processing logs

Question 2

Where in Webex Control Hub do you verify the health status of Hybrid Service connectors?

Accepted Answer

Services tab. In Webex Control Hub, the health status of Hybrid Service connectors is verified under the Services tab. Navigating to Services > Hybrid Services (or the specific service like Call/Calendar) shows connector status, registration state, and any alerts for each Expressway-C node running the connector.

Answer

Troubleshooting tab

Answer

Devices tab

Answer

Users tab

Question 3

Which protocol is required for the Webex Hybrid Directory Connector to communicate with on-premises Active Directory?

Accepted Answer

LDAP. The Webex Hybrid Directory Connector synchronizes user data from on-premises Active Directory to the Webex cloud, and it uses LDAP (Lightweight Directory Access Protocol) to query and read directory information from Active Directory. LDAP is the standard protocol for accessing and maintaining distributed directory information services.

Answer

XML

Answer

SIP

Answer

SNMP

Question 4

What is the impact of removing a node from a Hybrid Video Mesh cluster that is currently hosting active meetings?

Accepted Answer

Active calls are dropped or experience disruption. Removing a node from a Hybrid Video Mesh cluster that is actively hosting meetings will cause active calls to be dropped or experience disruption. The node is immediately removed from the cluster, and any meetings hosted on it are not gracefully migrated, leading to service interruption. This is a known behavior in Cisco Webex Hybrid Video Mesh.

Answer

The node remains active until the last call ends

Answer

The cloud takes over the media immediately

Answer

The meetings are automatically migrated to another node

Question 5

A user is unable to receive incoming PSTN calls via a Webex Calling Local Gateway. You observe that the INVITE from the provider reaches the CUBE, but the CUBE sends a 403 Forbidden. What is the most likely cause?

Accepted Answer

The incoming dial peer is missing or misconfigured. A 403 Forbidden response from the CUBE indicates that the incoming INVITE is being rejected due to a dial peer mismatch. The incoming dial peer is responsible for matching incoming calls and applying the correct configuration; if it is missing or misconfigured, the CUBE cannot route the call and returns 403.

Answer

The PSTN provider is using an unsupported codec

Answer

The Webex cloud is unreachable

Answer

The user's directory number is not in the PSTN white list

Question 6

Which license type is required to manage Webex Calling services in Control Hub?

Accepted Answer

Webex Calling License. Managing Webex Calling services in Control Hub — configuring users, numbers, dial plans, and PSTN — requires a Webex Calling license assigned to the administrator and to the users being managed. The Webex Calling license is what entitles the organization to the calling service and unlocks the Calling configuration sections in Control Hub. Without it, the Calling tabs are unavailable or read-only.

Answer

Webex Meetings License

Answer

Webex Room Device License

Answer

Webex Messaging License

Question 7

In a Webex hybrid environment, what is the primary role of the Expressway-C?

Accepted Answer

To provide a secure connector for Hybrid Services. Expressway-C is deployed inside the enterprise network and acts as the secure connector that initiates outbound-only connections to Expressway-E, which then relays traffic to Webex cloud services. This connector role is what enables Hybrid Services (Calendar, Message, Directory, Management, Call) to traverse the firewall without inbound pinholes. It does not manage DNS or replace CUCM; it is purely a traversal/connector component in the hybrid architecture.

Answer

To manage public DNS records

Answer

To act as a SIP proxy for internal phones

Answer

To replace the CUCM server

Question 8

Which TWO tasks must be performed when setting up Webex Hybrid Calendar service with Microsoft Exchange?

Accepted Answer

Grant the service account ApplicationImpersonation rights. Option D is correct because the Webex Hybrid Calendar service connects to Microsoft Exchange on-premises via Exchange Web Services (EWS) using a dedicated service account, and that account must be granted the ApplicationImpersonation management role so it can act on behalf of users to read and manage their calendar data. Option E is correct because the Hybrid Calendar service must be activated and configured in Control Hub (the Webex administrative portal), where you enable the service and supply the Exchange environment details and service account credentials that tie the on-premises deployment to the cloud service. Options A, B, and C are incorrect: no dedicated DNS zone for Exchange is required, Hybrid Calendar does not use a SIP trunk between Exchange and Webex, and no H.323 gateway in the DMZ is involved since the integration relies on HTTPS/EWS rather than telephony signaling.

Answer

Create a dedicated DNS zone for Exchange

Answer

Configure a SIP trunk between Exchange and Webex

Answer

Install an H.323 gateway in the DMZ

Question 9

When troubleshooting Webex Calling, which THREE factors are critical for maintaining call quality over a hybrid network?

Accepted Answer

Quality of Service (QoS) tagging. Option A (QoS tagging) is correct because marking voice RTP packets with DSCP values such as EF (46) lets routers and switches prioritize real-time media over bulk data, preventing jitter and packet loss during congestion. Option C (low round-trip time/latency) is correct because Webex Calling uses RTP over UDP, and excessive latency (generally above 150 ms one-way) causes talk-over and degraded interactivity that no amount of bandwidth can fix. Option D (sufficient upload/download bandwidth) is correct because each concurrent call consumes roughly 100 kbps per direction plus overhead, and insufficient throughput leads to dropped packets, choppy audio, and failed call setup. Option B (local database replication speed) is not relevant because Webex Calling is a cloud service and does not depend on on-premises directory replication for media quality. Option E (hardware firewall bypass) is not a valid practice; firewalls should be properly configured with the correct ports and media traversal rather than bypassed, which would create security risks without guaranteeing call quality.

Answer

Local database replication speed

Answer

Hardware firewall bypass

Question 10

Which THREE items are required to successfully register a room device to Webex?

Accepted Answer

A valid Webex Device license. Option A is correct because registering a room device to Webex requires a valid Webex Device license assigned to the device in Control Hub, which authorizes the device to use Webex cloud services. Option D is correct because the device must be onboarded using a valid activation code generated from Control Hub, which the device uses to authenticate and complete registration. Option E is correct because the device needs an active internet connection to reach Webex cloud endpoints and complete the cloud registration process. Options B and C are not required: a local SIP trunk and an existing CUCM registration are on-premises telephony concepts and are not prerequisites for Webex cloud device registration.

Answer

A local SIP trunk

Answer

An existing CUCM registration

Question 11

Which TWO of the following describe the purpose of the Webex Edge for Devices service?

Accepted Answer

Enables hybrid registration (CUCM + Cloud). Option D is correct because Webex Edge for Devices enables hybrid registration, allowing endpoints to register to on-premises Cisco Unified Communications Manager (CUCM) while still consuming Webex cloud services such as Webex Meetings and Webex Calling. Option E is correct because the service provides cloud-based management and control of devices that remain registered on-premises, letting administrators manage them through Control Hub. Options A and B are incorrect because Webex Edge for Devices is not a local gateway provisioning tool nor a SIP trunking gateway; those functions belong to services like Cisco Unified Border Element (CUBE) or Webex Edge Connect. Option C is incorrect because Webex Edge for Devices does not replace a web proxy; proxy requirements are handled separately by the organization's network and Webex Edge Connect design.

Answer

Automatically provisions local gateways

Answer

Provides a SIP trunking gateway

Answer

Replaces the need for a web proxy

Question 12

A company is deploying Webex Hybrid Directory Service to synchronize on-premises Active Directory users to Webex Control Hub. The administrator has installed the connector on a Windows Server 2019 machine and configured the required DNS SRV record. During the connector setup, the administrator is prompted to provide credentials for a service account. Which of the following must be true about this service account?

Accepted Answer

It must have read access to the Active Directory partitions containing the users to be synchronized.. The Hybrid Directory Service connector authenticates to Active Directory using a service account that must be able to read the directory partitions containing the users to be synchronized. No administrative write privileges or special group memberships are required. This least-privilege model ensures the connector can perform its synchronization task without exposing the environment to unnecessary risk.

Answer

It must be a member of the Enterprise Admins group to synchronize users across all domains in the forest.

Answer

It must be a member of the Domain Admins group in Active Directory.

Answer

It must be a Microsoft Exchange mailbox-enabled account with a valid SMTP address.

Question 13

A collaboration engineer is configuring Webex Hybrid Call Service Connect to integrate an on-premises Cisco Unified Communications Manager (CUCM) cluster with Webex. The engineer has deployed Expressway-C and Expressway-E in the enterprise and has enabled the Hybrid Call Service Connector on the Expressway-C. After configuration, users in Webex Teams cannot place calls to on-premises CUCM-registered endpoints. Which of the following is the most likely cause?

Accepted Answer

The Expressway-C does not have a valid certificate trusted by CUCM for the SIP TLS connection.. Hybrid Call Service Connect relies on a SIP TLS connection between Expressway-C and CUCM. For this connection to work, both sides must trust each other's certificates. If the Expressway-C certificate is not trusted by CUCM, the TLS handshake fails, and calls between Webex Teams and on-premises endpoints cannot be established. Verifying and importing the correct certificates is a critical troubleshooting step.

Answer

The Webex Teams users have not been assigned the Webex Calling license.

Answer

The CUCM cluster is not configured with a SIP trunk to the Expressway-C.

Answer

The Expressway-E is not configured with a public IP address and cannot reach the Webex cloud.

Question 14

A collaboration engineer is configuring a Webex Calling PSTN option where the enterprise wants to keep its existing Cisco Unified Border Element (CUBE) and SIP trunk contract with the incumbent carrier, while still using Webex Calling for call control and user features. Which Webex Calling PSTN connection type should the engineer select in Webex Control Hub?

Accepted Answer

Local Gateway. Local Gateway is designed for organizations that want to retain their own on-premises PSTN connectivity, including the existing CUBE and carrier SIP trunk, while adopting Webex Calling for users and features. The CUBE registers to Webex Calling and acts as the local PSTN gateway, so the enterprise keeps its carrier contract and gateway investment without deploying a cloud-connected provider or Cisco PSTN service.

Answer

Webex Edge for Calling

Answer

Cloud Connected PSTN (CCP)

Answer

Cisco PSTN

Question 15

A collaboration engineer is designing a Webex Calling deployment for a company that requires all PSTN calls to egress through their existing on-premises Cisco Unified Border Element (CUBE) with a PRI circuit. The company wants to keep the PSTN gateway on-premises and use Webex Calling for internal and external calling. Which deployment option should the engineer choose?

Accepted Answer

Local Gateway. Local Gateway is the correct deployment option because it enables Webex Calling to route PSTN calls through an on-premises Cisco Unified Border Element (CUBE) or gateway, preserving the existing PRI circuit. This option is specifically designed for organizations that want to retain their on-premises PSTN connectivity while adopting Webex Calling for cloud-based call control and features.

Answer

Webex Calling with Cisco PSTN

Answer

Cloud Connected PSTN (CCP)

Answer

Webex Edge Audio